Add a regression test to verify that NLS translation works.

We've never actually had a formal test for this facility.
It seems worth adding one now, mainly because we are starting
to depend on gettext() being able to handle the PRI* macros
from <inttypes.h>, and it's not all that certain that that
works everywhere.  So the test goes to a bit of effort to
check all the PRI* macros we are likely to use.

(This effort has indeed found one problem already, now fixed
in commit f8715ec86.)

Discussion: https://postgr.es/m/[email protected]
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8c498479d70f963533d57d8bb1b3a58e00fe0d03

Modified Files
--------------
src/test/regress/expected/nls.out   |  35 ++++++++
src/test/regress/expected/nls_1.out |  20 +++++
src/test/regress/meson.build        |   2 +
src/test/regress/nls.mk             |   5 ++
src/test/regress/parallel_schedule  |   2 +-
src/test/regress/po/LINGUAS         |   1 +
src/test/regress/po/es.po           | 159 ++++++++++++++++++++++++++++++++++++
src/test/regress/po/meson.build     |   3 +
src/test/regress/regress.c          |  77 +++++++++++++++++
src/test/regress/sql/nls.sql        |  19 +++++
10 files changed, 322 insertions(+), 1 deletion(-)

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